A slight sag between rafters is ideal as it will allow any water to drain down the felt.
How to felt and batten a roof uk.
These battens were developed in conjunction with the bre and meet nhbc requirements for fully graded roofing battens.
Set the first batten at eaves so that the first course of tiles overhangs the gutter by 45 to 55mm or into the centre of the gutter whichever is the lesser distance.
Generally battens should be parallel to the eaves and ridge lines.
Work along the roof taking out any excess slack in the felt but do not pull it tight.
John brash works closely with specialised sectors of the construction industry delivering market leading environmentally sustainable best value and quality timber products.
Jb red battens from marley is a high quality roofing batten that is pre graded and meets the performance requirements of bs 5534.